RA8806 Datasheet, PDF (97/174 Pages) RAIO Technology Inc. – Two Layers Character/Graphic LCD Controller Specification

Preliminary Version 1.0
RA8806
Two Layers Character/Graphic LCD Controller
320
DDRAM1
240
Data
DDRAM2
240
Data
Figure 6-68 : Extension Mode(2) Register MAMR Bit[6:4] = 111h
Note that the extension mode is only display the combination of the DDRAM1 and DDRAM2 data. The
cursor movement or characters display is not continuous across them. So user must set two pages
separately on the screen. The RA8806 will combine the DDRAM1 and DDRAM2 data as a single display
in extension mode. So, there is some limitation on Extension Mode. For example, if RA8806 set to
Extension Mode(1) as Figure 6-67 for 640x240 dots panel. The data have to write into DDRAM1 and
DDRAM2. But the cursor moving of Common is not from 0 to 639. The users have to separate the
screen into 2 blocks and write data into DDRAM1 and DDRAM2 to create a complete 640x240 dots
picture. The Figure 6-69 shows the description.
:
:
:
:
:
DDRAM1
:
:
:
:
:
DDRAM2
Figure 6-69：Extension Mode(1) Cursor Moving
Of course, if use Horizontal Scrolling, then the screen is like the following Figure 6-70.
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